I have used Frontline Plus for dogs for more than 3 years on our two rescue dogs...I have never seen a single tick or flea on them with the amount of time they are outside on 3 acres of land. On their annual visit to the vet, they're praised for being parasite-free.

Some Additional Tips

Use a fine-tooth comb to remove dead fleas and eggs

Store product at room temperature

Remove the pet's collar

Apply as a spot between your pet's shoulder blades in 1 area that can't be licked